Income Taxes - Unrecognized Tax Benefits - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Unrecognized tax balance	$ 387	$ 551	$ 487	$ 458
Unrecognized tax benefits that would impact effective tax rate	285
Interest and penalties, net of tax benefits, in uncertain tax positions	8
Unrecognized tax benefits, interest and penalties accrued	46	$ 61
Decrease in unrecognized tax benefits is reasonably possible	19
Paypal
Income Tax Contingency [Line Items]
Unrecognized tax balance	55
Unrecognized tax benefits that would impact effective tax rate	$ 51